Subject: Re: [boost] [type_erasure]any(const binding<Concept>&, ...) compile error
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2012-07-27 14:08:53
On 07/27/2012 09:49 AM, Larry Evans wrote:
> The attached, when compiled with:
> #define CONSTRUCTIBLE_PH
> fails compilation despite satisfying this Concept constraint
> mentioned above.
It doesn't satisfy the requirements.
> However, when:
> //#define CONSTRUCTIBLE_PH
> it compiles & runs OK. The compiling version just doesn't use a
> placeholder in the args to Sig of constructible.
> Why doesn't the one with the placeholder in the Sig args compile?
> Maybe I'm not understanding what's meant by:
> Concept must contain a matching instance of constructible.
> Could you please explain what I'm missing?
You're passing an argument of type ph_value<_a>.
How would constructible<_a(const _a&)> (which
is the copy constructor) be viable?